Stainless Steel Pipes Dealers in Sambhal

• Country of Origin: India
• Material: Mild Steel
• Certification: ISO 9001:2008 Certified
• Finishing: Polished
• Min. Order (MOQ): As per Customer Requirement

Selection off screen diameters the designed yield of a tubewell is 150m²/h (1.5 cusecs) and a screen having 20% open area is proposed to be used in a length of 20m to tap an acquifer of 25m thick. Diameter, of the screen is to be worked out. As q = a x v where q = discharge in m²/s, a = effective open area of the screen v = entrance velocity in m/s (to be ltd. To 0.03 m/s) therefore, a = 150/3600 x 1/0.03 = 1.39m² taking effective area as 50% of that provided, in order to taking into account the reduction of the effective area of the screen opening with time due to incrustation rearrangement of the acquifer particles around the screen and coverage by gravel, etc. grains size curves of a typical aquifer materials covering sand are shown in figure : very fine sand fine sand medium sand coarse sand very coarse sand gravel all dimensions are in millimeters the required open area = 2 x 1.39 = 2.78m² open area of pipes = x d x l x open area where d = dia of pipe, l = length of pipe therfore, d = 2.78/ x 20 x 20 = 0.22m or 220mm the required sceen dia works out 220mm. selection of slot size acquifer material classification - the acqifer material may be classified into various categories according to the following ranges of the particle size: fine gravel - above 2.0 mm coarse sand 0.5 - 2.0 mm medium sand 0.25 - 0.5 mm fine sand 0.05 - 0.25 mm silt 0.002 - 0.06 mm clay below 0.000 mm typical slot pattern all dimensions are in millimeters developed view of a typical well screen plan slotted type all dimensions are in millimeters slotting arrangements

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